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/// <summary>
/// Method for reading the free space on all network drives
/// attached to the current system
/// </summary>
/// <returns></returns>
public Hashtable ReadFreeSpaceOnNetworkDrives()
{
    //create Hashtable instance to hold our info
    Hashtable driveInfo = new Hashtable();
    //query the win32_logicaldisk for type 4 (Network drive)
    SelectQuery query = new SelectQuery("select name, FreeSpace from win32_logicaldisk where drivetype=4");
    //execute the query using WMI
    ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
    //loop through each drive found
    foreach (ManagementObject drive in searcher.Get())
    {
        //add the name & freespace to our hashtable
        driveInfo.Add("Drive", drive["name"]);
        driveInfo.Add("Space", drive["FreeSpace"]);
    }
    return driveInfo;
}